Remove pointer dereference after free.

Addresses-Coverity-ID: 1091173
Acked-by: NMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: NGustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>